After that, he tweeted about accomplishing PSTV downgrade from 3.36/3.35 to 3.30. After people began to ask for proof, he shared a video about the process.
Video shows a PSTV running with firmware 3.36. After that, xmaxkatsu seems to write something with a disk image writer utility (to the NAND of PSTV?) while the PSTV is running. After restarting the PSTV, PSTV shows a serious error and restarts in safe mode. Choosing “Update System Firmware” and “Update from USB Storage” PSTV asks for firmware 3.30 for update, not 3.36 it should normally ask. As the video ends here, we can’t see if the PSTV finishes the 3.30 update without errors or not.
It is up to you to decide if it is real or not. [Note from Wololo: XmaxKatsu has been losing credibility over the months, announcing several hardware hacks on the PS Vita that he never released]. Even if this one is real, it is a hardware downgrade method and from what I gathered reading xmaxkatsu’s tweets, it has a minimum firmware limit.
We will be sure to keep you updated if any new information comes.